hardened API decoding against server fields the models did not expect

The Talk room list crashed for a new account because the server omits
lastMessage for rooms without a visible message and the model required it.
Beyond that single field, a review of the Talk models against the OpenAPI
spec of the installed version (23.0.8) found the same crash class in several
places: closed enums over open server values (inCall bitmask, rich-object
types, actor and message types), a deleted parent sent as {id, deleted},
and the autocomplete status arriving as an object.

- json_serializable `checked: true`: decode errors now name class and field
- lists (rooms, messages, participants, autocomplete) decode per entry;
  a malformed entry is skipped and reported via ClientErrorReporter
- unknownEnumValue fallbacks for all response enums of Talk and breakers
- lastMessage nullable; inCall as bitmask; deleted parent placeholder;
  autocomplete status object/string; fixed shareWithDisplayNameUnique key
- GetRoomParams no longer sends null query parameters

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HrepDTL4qDe35TuS29sLW3

lib/state/app/modules/ticker/bloc/ticker_state.g.dart

@@ -6,15 +6,25 @@ part of 'ticker_state.dart';
 // JsonSerializableGenerator
 // **************************************************************************
 
-_TickerState _$TickerStateFromJson(Map<String, dynamic> json) => _TickerState(
-  ticker: json['ticker'] == null
-      ? null
-      : TickerResponse.fromJson(json['ticker'] as Map<String, dynamic>),
-  nav: json['nav'] == null
-      ? null
-      : TickerNavResponse.fromJson(json['nav'] as Map<String, dynamic>),
-  selectedSlug: json['selectedSlug'] as String?,
-);
+_TickerState _$TickerStateFromJson(Map<String, dynamic> json) =>
+    $checkedCreate('_TickerState', json, ($checkedConvert) {
+      final val = _TickerState(
+        ticker: $checkedConvert(
+          'ticker',
+          (v) => v == null
+              ? null
+              : TickerResponse.fromJson(v as Map<String, dynamic>),
+        ),
+        nav: $checkedConvert(
+          'nav',
+          (v) => v == null
+              ? null
+              : TickerNavResponse.fromJson(v as Map<String, dynamic>),
+        ),
+        selectedSlug: $checkedConvert('selectedSlug', (v) => v as String?),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$TickerStateToJson(_TickerState instance) =>
     <String, dynamic>{